Testing is great and important. Have there been any parallel-feed tests this time to see how the code handles real account sizes, trafic, etc? But more importantly, are there any kill switches for the part of the HF that some people predict might reap havoc on the platform or even drive a mass exodus?

There are at least seven different ways how HF21 could backfire, and it would be nice knowing you guys have kill switches and contingency plans in place on what to act if any of these scenarios end up playing out.